Weft detector mounted on indicating plunger of regularly-moving transferrer arm



De. 1s, 192s. 1,695,402

K W. H. WAKEFIELD WEFT DETECTOR MOUNTED 0N INDICATING PLUNGER OF REGULARLY MOVING TRANSFERRER ARK Filed Nov. 10, 1927 www y au

Patented Dec. 18, 1928.

UNITED vSTATES A1,695,402 PATENT OFFICE.

WALTER H. WAKEFIEJD, OF WORCESTER, `MIASSACHUSETTS, ASSIGNOR TO CROMPTON & KNOWLES LOOM WORKS, OF WORCESTER, MASSACHUSETTS, AWCORPORATION OF MASSACHUSETTS.

WEFT DETECTOR MOUNTED ONINDICATIG PLUNGER OF REGULARLY-MOVING TRANSFERRER ARM.

r.Application led November V10, 1927.. Serial No. 232,422. i

This invention relates to improvements in weft detectors of the type mounted on regularly moving transferrer arms and it is the general object of the invention to provide a sliding detector carrier of simplified construction operatively connected at all times to the indicating plunger.

In co-pending application Serial No. 232,- 432 filed by Cederlund there is set forth a weft detector mounted on a carrier which is slidably supported on the transferrer arm to move in a direction substantially parallel to the surface being detected The purpose of making the carrier slidable is` to avoid the complication incident to the use of a pivoted carrier due to thefact that the transferrer arm swings in an arc of comparatively small radius. s set forth in said application the carrier is attached to any auxiliary plunger and it is an limportant object of my prese-nt invention to secure the/detector carrier directly to the usual indicating plunger.

In the usual construction of transferrei.

when the detector is in contact with sufficient.

yarn.

referred to there is customarily usedv an indicating lever having a resetting cam ,effectivey b v the coninued upward movement of the transfer-rer arm to reset the plunger. .The device set forth herein depends for its resetting upon an indicating lever of the type specified, the plunger being locked linnon-V indicating position by aweighted actuator which itself is acted upon by the same spring which tends to move the plunger to indicating position. 1

With these and other objects in yview which will appear as the description proceeds, my invention resides in the combination k'and With an indicating plunger of the type.

Fig. 2 is a view similar to Fig. 1 but vwith .the detector moved to an indicating position,

Fig. 3 is a fragmentary top plan view taken in the direction of arrow 3, Fig. 1, and

Fig. 4 is a transverse vertical section on line 4--4 of Fig. 1. t

Referring to the drawings the transferrer arm 10 has an extension l1 which projects above and parallel to the bobbinB to be detected and receives a downward movement on each detecting beat of the loom by mechanism not shown but. indicated in patent to Ryon No. 1,372,316. An indicating plunger 12 is slidably mounted in a portion of the transferrer arm and also Vextends through a web 13. `Spaced walls` 14 of the transferrer `arm define Ya vertical slot 15 in which the operatin parts of the weft detector are located.V compression spring 16 surrounds a portion of the plunger and the right end thereof exerts its pressure against the pin 17 passing through the plunger, said spring tending normally to move the plunger from the non-indicating position shown in Fig. l

.tothe indicating position illustrated in Fig. 2.

K An indicating lever 18 pivoted on a fixed part of the weft replenishing mechanism not shown is located above the plunger when the latter is in indicating position with thetransferrer arm in its eXtreme low position. The upper portion of said lever is provided with an inclined cam face 19 which engages the right end of the plunger as the transferrer v ascends to move said plunger to the left relatively to the transferrer arm for the purpose of resetting said plunger. This form of lever having the cam face 19 is set forth in patent No. `1,551,219 to Ryon.

In carrying my invention into effect I proetector carrier 30 which' is sevide a 4weft cured to the left end of the plunger b means of n, mit 3i and said carrier catena .shown in Fig. 1.

upwardly through the slot 15 and is guided by bosses 32 one `of which is located on each of the walls 14. By means of the bosses the carrier 3() is held in proper vertical 'position and' is alsoV permitted to slide with :the plunger..AV A Y i The detecting element D is formed with a square shank 33 and has a lower horizontal arm 34 "provided `with teeth 351 :which enterI a sufficient supply of weft to prevent `sliding movement of the plunger as will be described hereinafter. A compression spring 36 v`surrounds a portion of the carrier and lies between the upper horizontal arm 37 thereof and shoulder 37" formed on the shank of jthe detecting element D, said spring '36 normally holding the detector element yielding ly in low position.

The carrier is'provided with an intermediate horizontal stop arm 88 to cooperate with the actuator indicated generally at '39.. Said .actuator is mounted for limited pivotal movement about a. pin 40 extending between the walls 14and` has a` weighted portion 41 `and a stop finger 42 spaced from the weightedportion 41 to define a slot 43 proportioned to receive the stop arm 38 of the carrier.V

The actuator has depending .therefrom a forked arm 44 through which the plunger 12 extends andftliereis provided a washer 45 held against the forked arrn by spring 16. The latter spring is sufiicientfly strong to lift and hold inraised position the weight 41V so that the latter is normally in the dot` ted line position shown in Fig. 1 with the stop `linger 42'in horizontal alignment with" the stop arm 38.

Under normal conditions with the transferrer arm in raised position the detector element will bein its lowest position rela tively to thecarrier 30 and the actuator' 39 will be in the raised or dotted. line position As the transfert-er arm descends the horizontal detector portion 34 will engage the smfacetoV be detected and be held against furtherdownward movement as the transferrer arm continues to descend. Shortly thereafter thetransferrer arm'will come to rest but the weight 41 becauseof the f momentum thereof will 'continuje'to move downwardly to the full line position shown in Figs. 1 and2. This motion of the actuator will talre trie stop finger 42 4out of the path of the top arm 38 so that the latter is opposite the slot 43 and willalso place spring 16 under compression because of the forked arm 44. The compressing of spring 16 and the removal of the stop linger 42 does not take place until after the detector has engaged the surface to be detected and when sufficient yarn is present the detector 'and plunger will be able to resist the pressure of spring 16 bearing against the pin 17 and the plunger will remain in non-indicating position. As soon as the momentum of `the weighted part 41 has `been overcome the spring-16 will begin-to `expired to raise the stop finger 42 in the path of the stop arm 38, this action taking place before the detecrtor becomes :completely disengaged from a `sufficient supplyof weft, so that upon the upward movement `of `the transfcrrer arm the parts will be retained 1n the non-indicating. "posi-tion indicated in Fig. 1.

llhen insufficient weft present., however, the friction between the detector and the bob- `bin Ais reduced -so that Athe compressed spring actuator Btlwill be acted upon to move rip-- `wardly as soon as the momentum of the weighted part is spent, but with the parts in 'the lposition shownv in Fig. 2 this upward movement will be arrested when the 'linger 42 engages the underside of the arm 38 as `indicated in dotted lines in Fig. 2. As the transferrer arm continues to rise, however, the plunger will engage the cam portion 19 of the indicating lever and will be moved positively to the left, thusV carrying the `stop arm 38 ont of the path of the stop linger 42 to permit the spring .16 to `raise the' actuator Vto the normal or dotted'lineposition shown in Fig. 1- relatively to the transferrer.

From the foregoing it will be seen that I have provided a weft detector mounted on a regularly movingtransferrer arm wherein the detecting ele-ment is mounted directly on the indicating plunger and that the usual form of latch isomitted. It will further be seen that the sto Y which limit movement of the detector carrier andplunger are dependent for their cooperation upon the weighted Y actuator and itrwill further be seenlthat the detector which prevents the indicating plungerfrom moving to indicating` position when sufficient weft is present also prevents indicating movement of the carrier and hol-ds the plunger while the stop finger 42 is moving ont of stopping position. The unlocking and relooking which takes place on each detecting beat of the loom occurs within the time that the detector is in engagement with the yarn. It will also be seen that the inclined portion of the indicating lever serves to move the detector as well as its carrier back to normal position and that the stop finger 42 acts by reason of spring 16 to Ysnap int-o locking position to retain the parts be limited' tojthe details herein disclosed, but

what I claim is:

1. In a weft detecting mechanism for looms having a regularly moving transferrer arm, an indicating plunger slidably mounted on the transferrer arm, a weft detecting element, a carrier for the element supported by vand movable withl the indicating plunger,

and means tending to move the indicating plunger from non-indicating to indicating position on each detecting beat of the loom, engagement of the detector with a sullicient supply of weft preventing movement of the plunger to indicating position.

2. In weft detecting' mechanism for looms having a regularly moving transferrer arm, an indi ating plunger slidably mounted on the transferrer arm and normally held in non-indicating position, a weft detecting clement supported by and movable with the plunger in a direction substantially parallel to the surface being detected, and means tending` to move the indicating plunger and detector element in a direction parallel to the surface being detected on each detectl ing beat of the loom, engagement of the detector with a suliicient supply of iveft preventing movement of the indicating plunger from non-indicating to indicating position.

3. In vveft detecting ymechanism for looms having a regularly moving transferrer arm, an indicating plunger slidably mounted on the transferrer arm in a direction subst-antially parallel to the length of the surface being detected, a detector element supported by and movable with the plunger, means normally holding the indicating plunger in non-indicating position, and additional means effective on detecting beats of the loom to tend to move the plunger in a direction parallel to the length of the surface being detected, a sufcient supply of weft engaging the detector to prevent movement of the indicating plunger from non-indicating to indicating position.

4L. In weft detecting mechanism for looms .having a regularly moving transferrer arm, an indicating plunger slidably mounted on the transferrer arm in a direction substantially parallel to the length of the surface being detected, a. detector carrier secured to and movable With the indicating plunger and guided by the transferer arm, a detecting element slidably mounted on the vcarrier and yieldingly held in low position relatively to the carrier, means to hold the indicating plunger normally in non-indcating position, and additional means tending on each detecting beat of the loom to move the indicating plunger toward indicating position, a.,

and also preventing movement of the indieating plunger, and means' operative on each detecting beatof the loom to unlock the plunger and also exerting a force tending to move the plunger toward indicating position, a suflicient supply of vveft engaging the detector to prevent movement of the plungertoward indicating position.

6. In weft detecting mechanism for looms having Aa regularly moving transferrer arm, an indicating plunger' slidably mounted on the transferrer arm in a direction substantially parallel to the length of the surface being detected, a weft detecting element supported by and movable with the detector in a direction parallel to the length of the surface being detected, locking means tending normally to hold the indicating plunger in non-indicating position, and devices operative on each detecting beat of the loom to simultaneously unlock the indicating plunger and exert a force tending to move said plunger 'toward `indicating position, the detecting element When in contact with asufficient supply of vveft preventing movement of the indicating plunger toward indicating position.

7. In vveft' detecting mechanism for looms having a regularly ,moving transferrerA arm, an indicating plunger slidably mounted on the transferrer arm in a direction substantially parallel to the length of the surface being detected, an indicating lever having a resetting cam fac-e, a detecting element supported by and moving With the indicating plunger, means effective to move the indicating plunger to indicating position when the detector engages an insufficient supply of weft, the plunger engaging Vthe cam face of the indicating lever and moved by Ythe cam face to rei-:tore the detector to normal position, and means to hold said detector and plunger in normal position.

In testimony whereof I have hereunto afxed my signature.

WALTER H. VAKEFIELD.

soV 

